Detached-Eddy Simulation of a Louver-Cooling Scheme for Turbine Blades

C. X-Z. Zhang, S. I. Kim, I. Hassan

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

The performance of a louver-cooling scheme on a flat plate was analyzed using a detached-eddy-simulation turbulence model. It was assumed that the louver-cooling scheme was tested in a wind tunnel with the mainstream flow velocity of 20 m/s, equivalent to a Reynolds number of 16,200, based on the jet diameter. Turbulence closure was achieved by a realizable k-e-based detached-eddy-simulation turbulence model. Solutions of two blowing ratios of 0.5 and 1 were successfully obtained by running parallel on 16 nodes on a computer cluster. The flowfields were found to be highly unsteady and oscillatory in nature, with the maximum fluctuation of the adiabatic effectiveness as high as 15% of the time-averaged value. It is shown that the fluctuations in the adiabatic effectiveness are mainly caused by the spanwise fluctuation of the coolant jet and the unsteady vortical structures created by the interaction of the jet and the mainstream.
Original languageEnglish
Pages (from-to)1133-1140
Number of pages8
JournalJournal of Propulsion and Power
Volume24
Issue number5
DOIs
Publication statusPublished - Sep 2008

Keywords

  • DES
  • turbine cooling
  • gas turbine
  • unsteady simulation

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